Datasheet

C515C
Data Sheet 90 2003-02
Figure 41 AC Testing: Input, Output Waveforms
Figure 42 AC Testing: Float Waveforms
Figure 43 Recommended Oscillator Circuits for Crystal Oscillator
AC Inputs during testing are driven at V
DD
- 0.5 V for a logic ‘1’ and 0.45 V for a logic ‘0’.
Timing measurements are made at
V
IHmin
for a logic ‘1’ and V
ILmax
for a logic ‘0’.
0.45 V
V
DD
0.2 - 0.1
+ 0.90.2
DD
V
Test Points
MCT00039
V
DD
- 0.5 V
MCT00038
V
Load
V
Load
-0.1 V
+0.1 V
Load
V
Timing Reference
Points
V
OH
-0.1 V
+0.1 V
OL
V
For timing purposes a port pin is no longer floating when a 100 mV change from load voltage
occurs and begins to float when a 100 mV change from the loaded
V
OH
/V
OL
level occurs.
I
OL
/I
OH
≥ ± 20 mA
MCT02765
XTAL1
XTAL2 XTAL2
XTAL1
Crystal/Resonator Oscillator Mode Driving from External Source
External Oscillator
Signal
N.C.
2 - 10 MHz
C
C
C = 20 pF ± 10 pF (incl. stray capacitance) Crystal Mode :
:Resonator Mode
= depends on selected ceramic resonatorC